多项选择题
Which three Layer 2 access designs have all of their uplinks in an active state?（）
A. Flex Links B. loop-free U C. looped square D. looped triangle E. loop-free inverted U
多项选择题 Which three objectives would be met by designing Layer 3 switching in the Campus Backbone of a medium size installation?（）
多项选择题 WhichthreeLayer2accessdesignshavealloftheiruplinksinanactivestate？（）
单项选择题 WhenBGPtuningisused，howispacketflowintothee-commercemodulecontrolled？（）
